Malicious PDF — malware analysis report

Static analysis result for SHA-256 731919c370dddb6a…

MALICIOUS

PDF

77.2 KB Created: 2021-07-23 23:51:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 25d889352d448a0a61c8e1b6194f8a1a SHA-1: 08f64d91f559d9e67fb1bb1f7da7c96d8d0bcc2c SHA-256: 731919c370dddb6a5c3b964e8d20c9098e45cf04f0b7d3f4e5d0c70a35213f81
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware delivery through these links. The file's structure and URL patterns are consistent with a malicious PDF used to distribute further threats.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL http://amuseonline.com/absite/userfiles/file/14195038563.pdf In PDF document text
    • https://aedwea.com/upload/foto/nufuxiwuwitodiva.pdfIn PDF document text
    • https://loan-financial.com/wp-content/plugins/super-forms/uploads/php/files/b298d87f6659a3adf96216e1eff60f4f/tivuburevirufobelo.pdfIn PDF document text
    • https://www.adcgrain.com/wp-content/plugins/super-forms/uploads/php/files/623aba6dea74ed0f9b9121ee1cb1c591/94903786814.pdfIn PDF document text
    • http://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/dc506b089baa78dd6224de980ddf6118/93827166833.pdfIn PDF document text
    • http://maremio.ru/admin/ckfinder/userfiles/files/74837434927.pdfIn PDF document text
    • https://amagi.la/wp-content/plugins/formcraft/file-upload/server/content/files/16082b8eff3a08---kinaxonixiranag.pdfIn PDF document text
    • https://greshamgilessalon.com/wp-content/plugins/super-forms/uploads/php/files/1a976da77bc4680fb36186c6b982c06e/wadumi.pdfIn PDF document text
    • http://dianacb.cz/userfiles/file/likeburikerigozuzi.pdfIn PDF document text
    • http://visualpaint.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c14ff3d297e---jabalovafivom.pdfIn PDF document text
    • http://www.nachtruhe.info/up/files/mijumekunozule.pdfIn PDF document text
    • http://www.hj-bouwt.be/wp-content/plugins/formcraft/file-upload/server/content/files/1609f122569e68---tebobu.pdfIn PDF document text
    • https://www.marbelitesa.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160a1dbad57d6b---37149166942.pdfIn PDF document text
    • https://ural-aiti.ru/admin/ckfinder/userfiles/files/1969502556.pdfIn PDF document text
    • http://lamorenj.com/userfiles/files/10737287305.pdfIn PDF document text
    • https://www.kalirich.com/wp-content/plugins/super-forms/uploads/php/files/ep3eh4jhnadml1for252j5n066/37165805020.pdfIn PDF document text
    • http://high-keenltd.com/userfiles/file/13664776469.pdfIn PDF document text
    • https://swotin.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607bcd167422d---mepopexevimakejafiju.pdfIn PDF document text
    • http://myphamlulanjina.com/upload/files/82692523775.pdfIn PDF document text
    • https://propbrains.com/wp-content/plugins/super-forms/uploads/php/files/n625uinsa3gb7877rv71ihmma1/lidijibemejufu.pdfIn PDF document text
    • https://aquafilling.com/userfiles/file/9011236456.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=livro+-+thompson+e+thompson+gen%C3%A9tica+m%C3%A9dica+pdfPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c4fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC4FE 11232 bytes
SHA-256: 72a4fc2c916063d49ea0da1b3559f50fda339984cd9ff42c400eea996f617576
font_01_sfnt_off0000deb7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEB7 18344 bytes
SHA-256: e8b4d2c10128186429970f168c45fb830be2dee57e872bb7f22f4010dbf89aa2
font_02_sfnt_off00010c8b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C8B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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